CosmoCoffee

[Loison Hoi]

Hi,

I used WMAP3+SDSS data (May 2006 CosmoMC) with a modified scalar power spectrum. When I included the nonlinear effect in the matter power spectrum, nonlinear_pk = T, the chains would run into regimes which give:

mpk chi-sq: -Infinity

Does anyone know what is wrong?

I tried to output the matter power spectrum, and found it is of order 10⁻²⁰. However, when I turned off the nonlinear option, nonlinear_pk = F, the magnitude of the matter power spectrum is of order 10⁴, so I guess the code for the nonlinear effect breaks down for some models?

Thanks.

Loison Hoi
12 Nov 2006

[Loison Hoi]

I found that halofit.f90 says that:

Only tested for plain LCDM models with power law initial power spectra

Loison Hoi
14 Nov 2006